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"She died comfortably surrounded by family and friends at her home," John Thoresen, Director of the Barbara Sinatra Children’s Center told the Desert Sun.

The former model and Las Vegas showgirl married her famous husband in 1976, becoming his fourth wife. They were married for over 20 years before Frank's death in 1998.

In her 2011 book, "Lady Blue Eyes: My Life with Frank," Sinatra wrote of first meeting her future husband when she was asked to be a doubles partner with his second wife, Ava Gardner.

She also spent time at Sinatra's Palm Springs home while she was married to his neighbor, Zeppo Marx, of the famous Marx Brothers comedy family.

Sinatra talked to the New York Times in 2011 about her superstar husband remaining on friendly terms with his ex-wives, which she said didn't bother her.

"A very wise French lady once said to me: 'You never worry about old flames. You worry about new ones,'" Sinatra said.

Barbara became famous in her own right, becoming a well known philanthropist in the Southern California area. The couple founded the Barbara Sinatra Children’s Center in 1986.The center provides services for abused, neglected and at risk children.

Sinatra remained actively involved in the facility which bore her name.

In March the Children's Hospital Los Angeles partnered with the center to raise $250,000 for services for children and their families being treated at both facilities